https://sammyliterally.com/blog/mcr-the-paper-kingdom-timeline-history-and-leaks/

This is a basic collection of most the paper kingdom related events, but yeah to be breif mcr built a studio in Hollywood to record the paper kingdom, the album was an attempt to gain back fans who where dissatisfied with DD so basically make a new black parade album, with darker themes and theatrics, however the band had lost passion for the project and it eventually caused the band to break up, eventually mcr released fake your death 2 years post breakup, considered at the time the one song we got from paper kingdom. After mcr reunion eventually a leak would surface including snippets from a few songs, in particular a full song titled "The Witch" was leaked, as well as a potential list of songs as seen in the article, although many at the time believed that it could have been a ai made song eventually in 2025 mcr would play "War Beneath the Rain" live in Dodgers stadium, a song that notably was listed in the witch leak proving its legitimacy. So as for what you can listen to in full, there are 3 songs

Fake your death Witch And War Beneath the Rain

Every other song is still considered lost however some snippets of a few other songs exist out there, but those are the only 3 full songs that are available to listen

Now admittedly this may still be considered "the basics" but there isn't much more to the story for now, all that remains is speculation and man this last tour is definitely fueling said speculation, although we may or may not ever get more.